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(No Model.) 2 Sheets--Sheet 1.

1). HAZARD. CONVERTING REGIPROGA TORY INTO ROTARY MOTION- 0. 529,859. Patented Nov. 27, 1894.

n45 mums PETERS co, wo'munm. WASHINGTON, u. c.

I 2 Sheets-Sheet 2.

'(No Model.)

. D.HAZARD v I CONVERTING REGIPROGATORY INTO ROTARY MCTION.v No. 529,859.

Patented Nov. 27, 1894..

ATTOE/VEYS. I

NITEDH. STATES DEXTER HAZARD, OF MARQUETTE, MICHIGAN,

ASSIGNOR OF ONE-HALF T0 FREDERICK O. CLARK, OF SAME PLACE.

CONVERTING RECIPROCATORY INTO ROTARY MOTION.

SPECIFICATION forming part of Letters went No. 529,859, dated November 27,1894. Applioation filedJfeinuary22,1894- Serial No. 497,726. (No model.)

To and whom it may concern.-

Be it known that I, DEXTER HAZARD, of Marquette, county of Marquette, andState of Michigan, have invented a new "and novel Device for Converting Reciprocatory into Rotary Motion, which will prevent the difficulty of dead-centers and will provide the means whereby the operator can start a sewing-machine in either direction, as desired, of which the following isa specification.

My invention has'for, its object, first, to prevent the crank pin used in producing rotary motion from stopping on the centers; second. the construction of a mechanism which will enable the operator to start a sewing machine in the desired direction, when connected to the driving shaft and treadle by the use of the treadle only; and third, to keep said machine in continuous motion when it. is desirable to operate at a slow rate of speed.

In the drawings, Figure 1 is a face view of my lnvention, with a section of a reciprocating'arm attached. Fig. 2 is a View of a pair of gear wheels held in position byalong and short shaft, which are provided with ordinary cranks. Fig. 3 is a face view of my device connected to the treadle and driving shaft of a sewing machine; and showing a section of the large belt wheel, such as are used on said machines. Figs. 4. and 5, show the construction of gear Wheel A by which the operator can determine in what direction the treadle will start the machine. Fig. 6 is a section of the guideways and cross-head which hold the pivot and bar D in position. Fig. 7 is a detailed view of the spring F.

K is ahalf section of circular rim A, which is provided with cogs on its outside rim, and is the outside rim and the largest portion of the body of gear wheel A L is a hub turned on the outside rim to fit the open space in rim A, and forms the rest of the body of gear wheel A Hub L is provided. with notches on one side.

N N are small dogs fastened to rim A directly over the notches in hub L.

X X are springs fastened to rim A, and hold the dogs N above or bring the end of the dog in contact with the face of the notches in hub L.

nary pins.

M is a collar fastened to hub L by small ,screws, which prevents rim A coming off of hub L when in operation.

The combination of rim A, hub L, dogs N, springs X and collar M is gear wheel A which appears in the other views of my invention.

J is the end of the driving shaft of a sewing machine, to which hub L is attached and by which Wheel A is held in position.

B is an ordinary gear wheel of the same diameter as A and provided with the same number of teeth of corresponding size as those on A B is not provided with the dogs N N, springs X X and hub L, as appears in A.

J is a short shaft which holds B in position, so as to allow the teeth of B to mesh with those of A C O are connecting arms, which are held to wheels A and B and rocking bar D by ordi- E E are guideways, which hold a small cross-head in position. 4

C is the pitm'an, which is connected to bar D, the cross-head and treadle O, by ordinary turned pins.

G G are set-screws, held in position by projectinglugs,whichare cast to the guideways E E. These set-screws G are for the purpose of increasing or decreasing the tension of springs F. v

F F are springs held in position, one at each end of the guideways E, by the lugs K, which are also cast solid to" the guideways.

' The function of springs F is to create a bearing between'the end and center pins on rocking bar D, which is necessary in order to throw that end of bar D (to which the connectin g arm on A is attached) up at the same time the pitman O pulls the opposite end of bar D down; which will give momentum to B and cause B to throw the crank pin on A over the center, as the tension of the spring F will continue to press that end of bar D upward, to which the connecting arm of A is attached until the pin on B ap- 5 proaches its bottom center. Then, as the pitman moves bar D in the opposite direction,

the pin on A will have passed its bottom center to a point where bar D will have sufficient purchase on the pinof A to cause A to continue its motion, and throw the pin on 13 over its bottom center, when both ends of bar D will have a purchase on both wheels, until the crank pins approach the top centers, where the top spring F will perform the same operation of assisting bar D in causing one pin to pass over the center in advance of the other. In applying this mechanism to a sewing machine, the advantage of having wheel A constructed as described, lies in the fact, that no part of the mechanism is connected to the driving shaft, except the hub L, and as rim A is loose on said hub, the rim A and the rest of the mechanism cannot give momentum to the driving shaft until one of the dogs N on rim A is adjusted, so that the end of the said dog will come in contact with the face of the notches in hub L.

If rim A should move in the direction that would separate the end of the dog N adjusted from the face of the notch in L, the dog N would simply slip backward over the notches and L would remain unmoved.

By reference to Fig. 4, it will be apparent how the operator of a sewing machine can determine in which direction it is possible with this mechanism to give momentum to said machine, by the adjustment of either one of the dogs, as above described; and it is easy to determine which dog should be adjusted to come in contact with the notches on L, as described in order to start the machine in the desired direction.

A further advantage of my device over that of a crank in operating sewing machines lies in the fact, of the natural tendency of said cranks to stop near or directly on the centers, when it becomes necessary to start the belt wheel by hand, and as the location of the crank on sewing machines is such that its position is not apparent to the operator, it is now also necessary to start the machine by hand, in order to determine in which direction to move the treadle, in order to run the machine in the desired direction. With my device, it is not necessary to start the machine by hand, as it will always move in the desired direction, according to the adjustment of one of the dogs N, as above stated.

In applying this invention to a sewing machine, I prefer to have the guides and frame cast solid together, but the style of frame used with this device will depend upon the purpose to which it is applied.

I I are gear-wheels of uniform diameter, and number and size of teeth. J represents the short shaft which holds one of said gear wheels in position. J represents a driving shaft, which holds the other wheel I in position. II II are ordinary cranks attached to said shaft. This view is for the purpose of showing how the difficulty of dead centers could be overcome by connecting the arm 0 O to cranks H H. The same result of overcoming dead centers can be accomplished with the use of these gear wheels and cranks as is accomplished by connecting the arm 0 to the gear wheels themselves.

What I claim is- 1. In a machine for converting reciprocatory into rotary motion, the combination with the driving shaft and a short shaft, and the gear Wheels A and B mounted on said shafts respectively; the wheel A comprising the hub.L, having notches at one side and the collar M at the other, and the rim A; dogs N N fastened to said rim, and the springs X X bearing on said dogs; of the guideways E E; the rocking bar D provided with a crosshead, moving in said guideways; the springs F F; the lugs K and set'screws G; arm 0 0, connecting the ends of the rocking bar to the wheels A B the treadle O, and the pitman 0' connecting said treadle to said rocking bar; substantially as shown and described.

2. In a machine for converting reciprocatory into rotary motion, the combination with the driving shaft and a short shaft, and the gear wheels A and B mounted on said shafts respectively; of the guideways E E; the rocking bar D provided with a cross-head, moving in said guideways; the springs F F; the lugs K and set-screws G; arm 0 0 connecting the ends of the rocking bar D to the wheels A E the treadle O and the pitman 0' connecting said treadle to said rocking bar; substantially as shown and described.

Dated January 16, 1894.

DEXTER HAZARD.

In presence of- A. M. HAZARD, O. M. PARKER, 

